Appeal No. 97-2642 Page 24
Application No. 08/094,461
13. The engine 29 has two exhaust ports which correspond with
the respective exhaust pipes 11 and 12 such that exhaust gases
discharged from the engine pass immediately into the pipes 11
and 12 and thereafter to the main heat exchanger 13. The heat
exchanger 13 consists essentially of a pair of concentric
copper tubes 14 and 15, respectively, which extend between
opposed end plates 16 and 17. An annular water jacket is
provided in the gap between the inner tube 15 and the outer
tube 14. The exhaust pipes 11 and 12 are connected to the
heat exchanger 13 in a manner whereby exhaust gases from the
engine pass into the bore of the inner tube 15. A secondary
exhaust pipe 21 is connected to the heat exchanger 13 and
provides an outlet for exhaust gases entering the bore of
inner tube 15 via the exhaust pipes 11 and 12. The secondary
exhaust pipe 21 carries the exhaust gases to an exhaust system
appropriate to the particular engine where such exhaust gases
are dissipated. A hot water circuit consisting essentially of
a copper tube 23 provides a serial circuit via auxiliary heat
exchangers in the form of coils formed in the copper tube 23
around the exhaust pipes 11 and 12 and the secondary exhaust
pipe 21. The serial circuit includes a pump 24 and a holding
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Last modified: November 3, 2007